MC68HC811L1L1 View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
Manufacturer
MC68HC811L1L1 Datasheet PDF : 124 Pages
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Freescale Semiconductor, Inc.
8.5.1 Serial Peripheral Control
SPCR — Serial Peripheral Control Register
RESET:
Bit 7
SPIE
0
6
SPE
0
5
DWOM
0
4
MSTR
0
3
CPOL
0
2
CPHA
1
1
SPR1
U
$0028
Bit 0
SPR0
U
SPIE — Serial Peripheral Interrupt Enable
0 = SPI interrupt disabled
1 = SPI interrupt enabled
SPE — Serial Peripheral System Enable
0 = SPI off
1 = SPI on
DWOM — Port D Wired-OR Mode
DWOM affects all six port D pins.
0 = Normal CMOS outputs
1 = Open-drain outputs
MSTR — Master Mode Select
0 = Slave mode
1 = Master mode
CPOL — Clock Polarity
When the clock polarity bit is cleared and data is not being transferred, the SCK pin of
the master device has a steady state low value. When CPOL is set, SCK idles high.
Refer to Figure 8-2 and 8.2.1 Clock Phase and Polarity Controls.
CPHA — Clock Phase
The clock phase bit, in conjunction with the CPOL bit, controls the clock-data relation-
ship between master and slave. The CPHA bit selects one of two different clocking
protocols. Refer to Figure 8-2 and 8.2.1 Clock Phase and Polarity Controls.
SPR1 and SPR0 — SPI Clock Rate Selects
These two serial peripheral rate bits select one of four baud rates to be used as SCK
if the device is a master; however, they have no effect in the slave mode.
SPR[1:0]
00
01
10
11
E Clock
Divide By
2
4
16
32
Frequency at
E = 2 MHz (Baud)
1.0 MHz
500 kHz
125 kHz
62.5 kHz
SERIAL PERIPHERAL INTERFACE
8-6
TECHNICAL DATA
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